Timely testing of die on wafer reduces the cost to manufacture ICs. The bladder is alternately connectable with a source of pressure and to atmosphere through control valve. Similarly, the maximum number of rows of information storable in each page of each set is greater for each successive set of pages. For example, conveyance of the printing medium is controlled on the basis of the output signals from the first and second encoder sensors when a tail end of the printing medium is located adjacent to the first conveyance roller. The database may be updated by adding new tests for new features of the new version.